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Telebyte 209 Short Haul Modem

2305 Bering Drive 01850-001 Rev. G

San Jose, CA 95131 USA

(800) 260-5265 (408) 435-8400 FAX (408) 577-1792

Web: www.kerisys.com E-mail: sales@kerisys.com Page 1 of 5

Short Haul ModemQuick Start Guide

This document provides installation instructions for the Telebyte 209 Short Haul Modem (Keri

Systems P/N SHM-232). This short haul modem can be used to assist in long-distance, direct,

connections between a host computer and an access control network. The Telebyte 209 is fully

compatible with PC/AT serial communication ports and requires no external power for its

operation.

1.0 Specifications

1.1 Dimensions

0.85 inches High x 1.30 inches Wide x 3.00 inches Long

(2.16 cm H x 3.30 cm W x 7.62 cm L)

1.2 Connector

DB-9F with screw connection terminals

1.3 Cable Run Distance Per Wire Gauge

Using Belden 9502 or its equivalent, see Table 1

2.0 Installation

The short haul modems are shipped in pairs. One modem is attached to the master controller on the

access control network. The other is attached to the host computer's COM port.

NOTE: Each short haul modem has a small switch allowing the modem to be set for use with either

Data Terminal Equipment (DTE) or Data Communication Equipment (DCE) devices. Please ensure

that each modem's switch is set correctly.

The switch is used to set the modem to match the type of device it is connected to.

Insert a thin-blade screwdriver into the switch slot and verify the switch is turned completely

counter-clockwise for a DTE application or completely clockwise for a DCE application. Applying

too much pressure while turning the switch may damage the modem.

NOTE: When a KDP-252 cable is used, make sure the short haul modem switch is set for a DCE

application.

Data Rate (KBPS) Wire Gauge

19 24 26

9600 Baud 4.9 Miles 3.1 Miles 1.8 Miles

Summary of content (5 pages)

PAGE 1
Telebyte 209 Short Haul Modem 1.0 Specifications 1.1 Dimensions 0.85 inches High x 1.30 inches Wide x 3.00 inches Long (2.16 cm H x 3.30 cm W x 7.62 cm L) 1.2 Connector DB-9F with screw connection terminals 1.3 Cable Run Distance Per Wire Gauge Quick Start Guide This document provides installation instructions for the Telebyte 209 Short Haul Modem (Keri Systems P/N SHM-232).
PAGE 2
Quick Start Guide Telebyte 209 Short Haul Modem 2.1 Connecting to a PXL-250 Controller The DB-9 connector on the short haul modem and on the PXL-250 controller are both female. To make the short haul modem to controller connection a DB-9 male-to-male connector is provided (see Figure 1). Set the switch on the short haul modem to the DCE position by gently turning the switch completely counter-clockwise. Figure 1: PXL-250 Controller to Short Haul Modem Connection Short Haul Modem 2.
PAGE 3
Telebyte 209 Short Haul Modem Connecting to the Host Computer - DB-9 to DB-9 If the host computer's COM port uses a male DB-9 connector the short haul modem can be plugged directly to the COM port (see Figure 2). Set the switch on the short haul modem to the DCE position by gently turning the switch completely counter-clockwise. Quick Start Guide 2.3 Figure 3: Host Computer to Short Haul Modem Connection 2.
PAGE 4
Quick Start Guide Telebyte 209 Short Haul Modem 2.4.2 Using a "Twist" Reduction Plug If the reduction plug uses 2-3 twist wiring (pin 2 on the 25 pin side goes to pin 3 on the 9 pin side and pin 3 on the 25 pin side goes to pin 2 on the 9 pin side) make the connection as shown in Figure 4. Set the switch on the short haul modem to the DCE position by gently turning the switch completely counter-clockwise.
PAGE 5
Telebyte 209 Short Haul Modem Short Haul Modem to Short Haul Modem Wiring Two sets of twisted pair cables are used to connect the short haul modems. Connect the cable between the two modems as shown in Figure 5. The shield wire is not connected at either end of the cable. End of document. 2305 Bering Drive San Jose, CA 95131 USA (800) 260-5265 (408) 435-8400 FAX (408) 577-1792 Web: www.kerisys.com E-mail: sales@kerisys.